Color coating chromium-free pretreatment solution for galvanized plate

A technology of pretreatment liquid and galvanized sheet, which is applied in the direction of anti-corrosion coating, metal material coating technology, etc., can solve the complicated passivation process, the corrosion resistance of the passivation film is far from corrosion resistance, and the corrosion resistance effect is yet to be determined. Improvement and other issues to achieve the effect of stable and feasible process, improved corrosion resistance, and increased bonding force

Inactive Publication Date: 2011-05-25
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN 1974842A discloses the use of passivation treatment solution compounded by organosilane and molybdate corrosion inhibitor, which can achieve the passivation effect of chromate under the same conditions, but in a more complex corrosion environment, such as neutral Salt spray test, its corrosion resistance effect needs to be improved
Chinese patent CN 101182640A discloses a layer of organic silane gamma-aminopropyltriethoxysilane coated on the surface of galvanized steel sheet, and then enters the compound salt of cerium salt and lanthanum salt after drying the steel sh

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Example Embodiment

[0032] Example 1: Use 80 g of organic silane, 36 g of inorganic salt, 20 g of oxidizing agent, 2.4 g of complexing agent and the balance of deionized water and inorganic acid to prepare 1 liter of passivation solution with a pH of 3-4. Among them, the organosilane is prepared from γ-glycidoxypropyltrimethoxysilane and γ-methacryloxypropyltrimethoxysilane in a weight ratio of effective content of 4:1. The inorganic salt is made up of cerium nitrate and sodium molybdate, which is prepared according to the effective weight ratio of 2:1, and the inorganic acid is nitric acid.

[0033] The patented process is simple, the passivation liquid is stable, and the water resistance is good. The passivation process is carried out at room temperature. In a 5% NaCl aqueous solution, the corrosion potential is -1.09V and the polarization resistance is 1.429kΩ·cm after electrochemical testing. 2 And self-corrosion current is 42.84μA / cm 2 . The result of neutral salt spray experiment shows that ...

Example Embodiment

[0034] Example 2: Using 80 g of organic silane, 24 g of inorganic salt, 12 g of oxidizing agent, 2.4 g of complexing agent and the balance of deionized water and inorganic acid to prepare 1 liter of passivation solution with a pH of 3.5. Among them, the organosilane is prepared from γ-glycidoxypropyltrimethoxysilane and γ-methacryloxypropyltrimethoxysilane in a weight ratio of effective content of 4:1. The inorganic salt is made up of cerium nitrate and sodium molybdate, which is prepared according to the effective weight ratio of 2:1, and the inorganic acid is nitric acid.

[0035] The patented process is simple, the passivation liquid is stable, and the water resistance is good. The passivation process is carried out at room temperature. In an aqueous solution of 5% NaCl, the corrosion potential is -1.0327V and the polarization resistance is 11.418kΩ·cm after electrochemical testing. 2 And self-corrosion current is 4.314μA / cm 2 . The result of neutral salt spray test shows th...

Example Embodiment

[0036] Example 3: One liter of passivation solution with a pH of 4 was prepared with an effective content of 100 g of organosilane, 24 g of inorganic salt, 10 g of oxidant, 2.4 g of complexing agent, and the balance of deionized water and inorganic acid. Among them, the organosilane is made up of γ-glycidoxypropyl trimethoxysilane and γ-methacryloxypropyl trimethoxy silane, and is prepared at a weight ratio of effective content of 3:1. The inorganic salt is made up of cerium nitrate and sodium molybdate, which is prepared according to a weight ratio of effective content of 1:1, and the inorganic acid is nitric acid.

[0037] The patented process is simple, the passivation liquid is stable, and the water resistance is good. The passivation process is carried out at room temperature. In an aqueous solution of 5% NaCl, the corrosion potential is -1.0208V and the polarization resistance is 3.975kΩ·cm after electrochemical testing. 2 And self-corrosion current is 12.87μA / cm 2 . The ...

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Abstract

The invention discloses a color coating chromium-free pretreatment solution for a galvanized plate, and belongs to the technical field of chromium-free passivation of galvanized plates. The color coating chromium-free pretreatment solution comprises the following components in percentage by mass: 8 to 20 percent of organic silane, 1.2 to 4 percent of inorganic salt, 1 to 2 percent of oxidant, 0.12 to 0.24 percent of complexing agent and the balance of deionized water serving as a solvent. The pH value of the chromium-free pretreatment solution is 3 to 4, and is regulated through inorganic acid. The chromium-free pretreatment solution can form a three-dimensional netlike compact organic silane blocking layer based on a formed inorganic metal compound precipitation membrane; and meanwhile, because the organic silane is added, the bonding force of a passivation film and a galvanized layer can be increased, the corrosion resistance, washing resistance and abrasion resistance of the passivation layer can be improved, and the requirement of a color coating process can be fully met. The pretreatment solution can be prepared by using the conventional passivation equipment and processes, does not contain chromium, and is environmentally-friendly passivation solution.

Description

Technical field: [0001] The invention belongs to the technical field of chromium-free passivation of galvanized sheets, and in particular relates to a chromium-free pretreatment solution for improving the corrosion resistance and coating performance of galvanized sheets. Background technique: [0002] Color-coated steel plate has light weight, beautiful appearance and good anti-corrosion performance, and can be processed directly. It provides a new type of raw material for the construction industry, shipbuilding industry, vehicle manufacturing industry, furniture, electrical and other industries, and plays a role in replacing wood with steel. , efficient construction, energy saving, pollution prevention and other good effects. The galvanized sheet used for color coating needs surface pretreatment and passivation to form a chemical passivation film on the surface of the steel sheet to improve the adhesion between the coating and the galvanized sheet and the corrosion resistan...

Claims

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Application Information

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Owner ANHUI UNIVERSITY OF TECHNOLOGY
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